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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A303077 a(1) = 1, and for n > 1, a(n) is the greatest prime number whose binary digits appear in order but not necessarily as consecutive digits in the binary representation of n.

Table of values

n a(n)
1 1
2 2
3 3
4 2
5 5
6 3
7 7
8 2
9 5
10 5
11 11
12 3
13 13
14 7
15 7
16 2
17 17
18 5
19 19
20 5
21 13
22 11
23 23
24 3
25 13
26 13
27 13
28 7
29 29
30 7
31 31
32 2
33 17
34 17
35 19
36 5
37 37
38 19
39 23
40 5
41 41
42 13
43 43
44 11
45 29
46 23
47 47
48 3
49 17
50 13
51 19
52 13
53 53
54 13
55 31
56 7
57 29
58 29
59 59
60 7
61 61
62 31
63 31
64 2
65 17
66 17
67 67
68 17
69 37
70 19
71 71
72 5

List of values

[1, 2, 3, 2, 5, 3, 7, 2, 5, 5, 11, 3, 13, 7, 7, 2, 17, 5, 19, 5, 13, 11, 23, 3, 13, 13, 13, 7, 29, 7, 31, 2, 17, 17, 19, 5, 37, 19, 23, 5, 41, 13, 43, 11, 29, 23, 47, 3, 17, 13, 19, 13, 53, 13, 31, 7, 29, 29, 59, 7, 61, 31, 31, 2, 17, 17, 67, 17, 37, 19, 71, 5]

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